The Scale of Types

Posted on Edited on Word count in article: 617 Reading time ≈ 1 mins.

The scale of type int is[−231,231−1][-2^{31},2^{31}-1], and it is a little more than
[−2∗109,2∗109][-2*10^{9},2*10^{9}]. and the scale of long long type is [−263,263−1][-2^{63},2^{63}-1], and it is a little less than [−1019,1019][-10^{19},10^{19}]

int i = 106∗10610^{6}* 10^{6}; // this is wrong!!!

long long j = 109∗10910^{9}* 10^{9} ; // this is correct!

printf(“%d”,i);

printf(“%lld”,j);

int some platform or some compiler, long type is equal to int type. They are 32 bits. But long long type is 64 bits in linux.

use #define to declare a const, like this( if the number is too big):

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#define BIG (9000000000000000000)ULL // this is unsigned long long